Here are a couple of interesting links.

Nutrition King--nutritionking.com
James "Bubba" H. King--Independent Ag Consultant
Available for international & domestic on-site consulting on most row crops as well as golf courses.

The Dirt Doctor--Howard Garret -dirtdr.com
Leading Organic Home garden professional in the Dallas/Ft.Worth area. Local radio show on Sunday mornings.

Natural Solutions Environmental, Inc.-nsei.net
Organic Home garden professional in the Houston area.